Double slit experiment

Double slit experiment - Factbites
Where results make sense
About us | Why use us? | Reviews | PR | Contact us

Topic: Double slit experiment

Note: these results are not from the primary (high quality) database.

In the News (Mon 21 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Double-slit experiment - Wikipedia, the free encyclopedia
		The path length from the single slit to the double slit is equally important for obtaining the interference pattern as the path from the double slit to the screen.
		The experiment was repeated in 1989 by Tonomura et al at Hitachi in Japan.
		The experiment can also be performed with a beam of electrons or atoms, showing similar interference patterns; this is taken as evidence of the "wave-particle duality" predicted by quantum physics.
	en.wikipedia.org /wiki/Double-slit_experiment (1666 words)

	Wave-particle duality - Wikipedia, the free encyclopedia
		In the early 1800s, the double-slit experiments by Young and Fresnel provided evidence for Huygens' theories: these experiments showed that when light is sent through a grid, a characteristic interference pattern is observed, very similar to the pattern resulting from the interference of water waves; the wavelength of light can be computed from such patterns.
		Light was believed to be a wave, as Thomas Young's double-slit experiment and effects such as Fraunhofer diffraction had clearly demonstrated the wave-like nature of light.
		A dramatic series of experiments emphasizing the action of gravity in relation to wave-particle duality were conducted in the 1970's using the neutron interferometer.
	en.wikipedia.org /wiki/Wave-particle_duality (2103 words)

	The Feynman Double Slit
		In the two slit experiment, a particle does not show an interference pattern and the probability of a particle arriving at a location at the backstop with both slits open is just the sum of the probability of it arriving through the upper slit plus the probability of it arriving through the lower slit.
		Note that in a real experiment, the light bulb would have to be smaller than in the figure and tucked in more tightly behind the slits so that the electrons don't collide with it.
		The total energy in the interference pattern is equal to the energy arriving from the upper slit plus the energy arriving from the lower slit: the interference pattern re-arranges the energy but conserves the total amount of energy.
	www.upscale.utoronto.ca /GeneralInterest/Harrison/DoubleSlit/DoubleSlit.html#TwoSlitsElectrons (3519 words)

	HITACHI GLOBAL : Research & Development : Advances in Research
		You may be familiar with an experiment known as the " double-slit experiment," as it is often introduced at the beginning of quantum-mechanics textbooks.
		At the beginning of the experiment, we can see that bright spots begin to appear here and there at random positions (Fig.
		It should also be noted that the fringes are made up of bright spots, each of which records the detection of an electron.
	www.hqrd.hitachi.co.jp /em/doubleslit.cfm (491 words)

	The preparation of dynamical properties
		Experiment 1: In a darkened room, white light from an incandescent lamp is collimated by a slit and passes through a prism (figure left).
		A typical experiment consists of preparation, interaction, and measurement.The notion of preparation is an important conceptual foundation in the study of quantum mechanics.
		Doing this experiment reveals that the light beam is not spread out again by the second prism as the original white light beam was spread into a spectrum by the first prism.
	web.phys.ksu.edu /vqmorig/tutorials/online/prep/prep.html (1907 words)

	Double Slit Experiment Explained
		In the double slit experiment, when we allow just one electron (or in that case, even a photon) to pass through the slits (both open), we consider the probability functions of the electron and say that the this probability function splits up into 2 and after passing through the slits reinforce.
		That is to say that the electrons pass through both the slits simultaneously (provided that no one is observing).
		All they did was to notice that this is the way electrons behave, and then they built a mathematical formalism consistent with this behavior, and other known behaviors, so that they could guess what an electron might do in different circumstances.
	www.newton.dep.anl.gov /askasci/phy00/phy00713.htm (839 words)

	Young's double-slit experiment
		In his 1820 effort to solve the puzzling double refraction of light discovered in calcite by Erasmus Bartholin (1625-1698), Young devised and performed his famous double-slit experiment, the results of which led him to conclude that light is a transverse wave.
		The modern version of Young's double-slit experiment is so refined that a recording device or photographic film placed behind the slits in line with a controlled source (emitter) can record the activity of a single photon (or electron) at a time.
		This extraordinary wave-like result when both slits are open at the same time has remained unexplained since Young first performed the double-slit experiment in 1820.
	www.cox-internet.com /hermital/book/holoprt7-2.htm (541 words)

	Quantum Philosophy
		For example, blocking one path or the other or moving detectors close to the slits obviously disturbs the photons passage in the two-slit experiment as does placing a detector along one route of the delayed-choice experiment.
		The experiments involve a property known as flux, which is the area of the superconducting ring multiplied by the strength of the magnetic field perpendicular to the ring.
		The experiment relies on a parametric down-converter an unusual lens that splits a photon of a given energy into two photons whose energy is half as great.
	www.fortunecity.com /emachines/e11/86/qphil.html (6058 words)

	Flash's Forums: Young’s double slit experiment
		Quantum physics would say the interference pattern demonstrated by one-particle-at-a-time double slit experiments is the result of the interference between the probability waves for the two slits.
		In the classic experiment, particles sent through a single slit behave as if they've been sent through a single slit, while even if sent one at a time in a direction with two slits, they display an interference pattern after enough have been sent to make a pattern show up.
		That still dosn't explain really how each individual particle KNOWS it has a choice of two slits...
	k.1asphost.com /trux/forum_posts.asp?TID=20&get=last (430 words)

	The double-slit experiment (September 2002) - Physics World - PhysicsWeb
		Young carried out his original double-slit experiment with light some time in the first decade of the 1800s, showing that the waves of light from the two slits interfered to produce a characteristic fringe pattern on a screen.
		We believe that we carried out the first experiment in which the build-up process of an interference pattern from single-electron events could be seen in real time as in Feynman's famous double-slit Gedanken experiment under the condition, we emphasize, that there was no chance of finding two or more electrons in the apparatus.
		Moreover, the Bologna experiment was performed under very difficult experimental conditions: the intrinsic coherence of the thermionic electron source used by the Bologna group was considerably lower than that of the field-emission source used in the Hitachi experiment.
	physicsweb.org /articles/world/15/9/1/1 (3305 words)

	Youngs Double Slit Experiment
		ne of the most important experiments of wave theory is that of Young's double slits.
		The nearest screen is the one the with the two slits with light shining on it (Pink) and the diffraction pattern is visible on the screen behind.
		The experiment has been used subsequently to show that wave behaviour exists in many other areas of nature and therefore it is worth spending a little time going into the experiment in detail.
	www.qmw.ac.uk /~zgap118/2/yds.html (508 words)

	Double Slit Experiment
		This paper assumes one is somewhat familiar with the famous double slit experiment which establishes the quantum wave-particle paradox using either photons or electrons.
		Now set up the experiment again with two slits but include detectors that can sense which slit the particle goes through.
		The slits are reduced in size until interference effects show up on a screen and then the light source is reduced in intensity until only one photon or particle is emitted at a time.
	home.earthlink.net /~sroof/Abraxas/sar/doubslit.htm (1861 words)

	Double-slit experiment
		When one performs this type of experiment, one registers the detector positioned next to the slit blinking almost simultaneously with one of the detectors in the detector array.
		Those that pass through the slits hit the detector array in positions that are just opposite to the slits – they cannot wander around too much, since they have to follow the Newtonian trajectories, and these are quite restricted due to the fact that they have to go through the slits.
		The thought experiments Einstein invented display some of the most intriguing aspects of quantum mechanics, some of which are as paradoxical today as they were in Einstein’s time.
	nanoatlas.ifs.hr /double_slit.html (1881 words)

	Quantum Wierdness I: The double-slit experiment
		The experiment consists of a source (a pellet launcher, a paddle for producing water waves, or a hot filament for producing electrons), a screen with two small slits in it, and a detector at some distance from the source and screen.
		After those observations are made, the electrons continue to behave like a mixture, not like a superposition, so the interference patten on the detector is no longer seen; it is replaced by the double-peak pattern consistent with the observation of individual particles, some going through each slit.
		But if we wait long enough, the pattern produced will show the predictable double peak at the spots opposite the slits.
	www.telp.com /qw1.htm (1813 words)

	Olympus Microscopy Resource Center: Light and Color - The Double Slit Experiment: Interactive Java Tutorial
		The double slit diffraction experiment explores the optical interference phenomena discovered by Thomas Young.
		In this experiment, visible monochromatic light is diffracted through a screen with two adjustable slits.
		As the light waves spread out from the slit, they meet which results in interference between the two waves.
	www.olympusmicro.com /primer/java/doubleslit (355 words)

	Lesson 58: Young's Double Slit Experiment
		If a white light is used in the double slit experiment, the different colours will be split up on the viewing screen according to their wavelengths.
		The results of Young's Double Slit Experiment should be very different if light is a wave or a particle.
		A surprising experiment is that you can get the same effect from using a single slit instead of a double slit.
	www.studyphysics.ca /newnotes/20/unit04_light/chp1719_light/lesson58.htm (1161 words)

	Double slit experiment
		IMO those experiments do not demonstrate that when single neutrons are used (involving only one neutron at a time) in a double slit experiment that there is an interference pattern.
		This would be a classic double-slit experiment using photon detectors, in which the detectors (and the information they contain) are destroyed before any observer examines the screen to see if an interference pattern exists.
		My question is: is in each case the explanation the same ie the particle interferes with itself?
	users.telenet.be /nicvroom/dbslit1.htm (2118 words)

	Young's Double Slit Experiment
		I believe that for most implementations of this experiment, a simple single wide beam of electrons is thrown in the general direction of the slits.
		Even to the extent that the two slits are far enough apart that light cannot make it from one slit to the other to "tell" the other photon / electron whether the first slit is open or shut.
		So it's true, most of the electrons in the beam miss the slits and hit one of the 3 metal barriers (left right, or between the two slits) and are stopped.
	www.newton.dep.anl.gov /askasci/phy00/phy00782.htm (644 words)

	12_QF-Double-Slit-Experiment
		With the photons being fired individually in the double slit experiment with some time intervals, it is the antimatter side of the photon that waves in the V-positive poles and the matter side that waves in the V-negative poles and thus a twofold wave is produced with a single photon.
		This lead to the first double slit experiments where just one photon was allowed to pass through the slits at at time, with considerable time intervals before the nest one was allowed to pass.
		This lead to the first double slit experiments in 1090 where just one photon was allowed to pass through the slits at at time.
	www.peace-files.com /QF-L-12/01_QF-Double-slit.html (3627 words)

	Double Slit Experiment Revisited
		Given our understanding of light as waves, it is possible to give a more accurate representation of the double slit interference pattern given in Fig.
		Figure 10.17: Wave description of the two slit experiment
		The beam of light approaching the two slits from left consists of approximately plane waves, whose crests are shown in Fig.
	theory.uwinnipeg.ca /mod_tech/node127.html (173 words)

	The double slit experiment and the collapse of the wavefunction
		How the electron itself moves (whether it passes through one of the slits or both - or how the wavefunction is related to the actual electron) is a question that is not well defined in quantum mechanics - some would say that it is not a valid question.
		The resulting probability distribution will show the interference effects only when both slits are open.) You can also move the detectors closer to the slits to identify through which hole the electron passes through.
		But in that case, the process becomes similar to having the sum of the effect of the individual slits being open one at a time.
	www.fen.bilkent.edu.tr /~yalabik/applets/collapse.html (628 words)

	Physics: Albert Einstein Theory of Relativity: WSM in Absolute Space explains Albert Einstein's Theory of Relativity
		Newton's endeavours to represent his system as necessarily conditioned by experience and to introduce the smallest possible number of concepts not directly referable to empirical objects is everywhere evident; in spite of this he set up the concept of absolute space and absolute time.
		As the dimension of mater as Spherical Wave Motions is determined by BOTH the wavelength and shape of the ellipsoidal standing waves about the Wave-Centre of the electron (matter), which relates to the motion of the centre, thus the moving electron's spatial dimensions must be distorted into an ellipsoidal shape.
		For example, electrons near one another in Space experience a mutual force of repulsion and this behaviour can be mathematically described using Faraday's e-m field which quantifies this force and describes how it varies with distance and direction.
	www.spaceandmotion.com /Physics-Albert-Einstein-Theory-Relativity.htm (11475 words)

	Slashdot Double-Slit Experiment in Time, Not Space
		The experiment is the same as a known one, with a single difference: In the traditional experiment the slits are separated by a difference in the normal 3d space, But in this experiement the slices are at the same place in the normal 3d space but separated by a difference in time.
		I thought the meaning of the double slit test was to prove that the single electron actually passed through both slits, and in essence interfered with itself.
		So in the usual dual slit experiment the state of a photon, say, that has passed through the slits, is a superposition of two states - having gone through one slit or having gone through another slit.
	science.slashdot.org /science/05/03/02/2231215.shtml?tid=14 (6290 words)

	Young double slit experiment
		The path difference of the light from each slit must be 1/2 wavelength for destructive interference.
		I don't know what Young did in his orginal experiments to get a monochromatic source, but he could have used a filter or a prism to select a single wavelength.
		I assume he used a sodium lamp - it's monochromatic enough (not coherent though - that doesn't mean it's impossible to do but it makes it bl--dy hard (speaking from experience here
	www.physicsforums.com /showthread.php?threadid=100285 (539 words)

	SPACE.com -- Quantum Astronomy: A Cosmic-Scale Double-Slit Experiment
		In the preceding three essays we discussed Young’s double-slit experiment where light was shown to behave as a wave.
		Each article is a piece of a mosaic, so every one is needed to understand the final explanation of the quantum astronomy experiment we propose, possibly using the Allen Telescope Array and the narrow-band radio-wave detectors being build by the SETI Institute and the University of California, Berkeley.
		What we have outlined here is just one experiment in many possible experiments that could be performed in what may be one of the most interesting new fields of the 21st Century, quantum astronomy.
	www.space.com /searchforlife/quantum_astronomy_050113.html (1573 words)

	DoubleSlit
		This probability function is valid if the slit-to-screen distance is much greater than the slit spacing, and the width of each slit is less than the wavelength.
		This is a simulation of single particles (electrons or photons) being detected on a screen after passing through a pair of closely spaced vertically aligned slits.
		In the simulation, f is chosen to be 4.
	www.ianford.com /dslit (589 words)

	ScienceDaily: Can An Electron Be In Two Places At The Same Time?
		For that, a molecular double slit experiment is required that is based not upon position-momentum uncertainty, but on reflective symmetry.
		The experiments were carried out by members of the working group "atomic physics" of the FHI at the synchrotron radiation laboratories BESSY in Berlin and HASYLAB at DESY in Hamburg.
		Although each electron seems to go alone through one of the two slits, at the end a wavelike interference pattern is created, as if the electron split while it went through the slit, but then was subsequently re-unified.
	www.sciencedaily.com /releases/2005/10/051013084257.htm (2641 words)

	SPACE.com -- Quantum Astronomy: The Double Slit Experiment
		However, light shown through two slits that are close together creates not two spots on the screen, but rather a series of alternating bright and dark lines with the brightest line in the exact middle of this interference pattern.
		One could send one photon (or “quantum” of energy) through a single slit at a time, with a sufficiently long interval in between, and eventually a spot builds up that looks just like the one produced when a very intense (many photons) light was sent through the slit.
		This shows that light is a wave since such a pattern results from the interference of the waves coming from slit one (which we shall call “A”) with the waves coming from slit two (which we shall call “B”).
	www.space.com /searchforlife/quantum_astronomy_041111.html (1292 words)

	The Open Door Web Site : IB Physics : Waves : Young’s "Double Slit" Experiment
		The single slit ensures that the two slits in the double slit are coherent sources.
		is further from slit b than from slit a.
		is midway between the two slits so waves from the two slits will arrive at O
	www.saburchill.com /physics/chapters2/0013.html (153 words)

	Young's Double Slit Experiment
		Two light rays pass through two slits, separated by a distance d and strike a screen a distance, L, from the slits, as in Fig.
		The above formulas assume that the slit width is very small compared to the wavelength of light, so that the slits behave essentially like point sources of light.
		is approximately equal to the angle that the rays make relative to a perpendicular line joining the slits to the screen.
	theory.uwinnipeg.ca /physics/light/node9.html (270 words)

Try your search on: Qwika (all wikis)

Topic: Double slit experiment

Ads by Google

Related Topics

In the News (Mon 21 Dec 09)